Abstract Experimental conditions have now been developed whereby o-bromophenyllithium (II) may be prepared in excellent yields and used as an organometallic intermediate for the synthesis of a variety of ortho bromo substituted phenyl compounds (o-BrC 6 H 4 X). THe thermal stability, decomposition products and reactions of II wre studied. REactions between II and a variety of substrates, eg, CO 2, dimethylformamide, fluorinated esters, ...